Inserted saw-tooth



"F. W. COOK.

INSERTED SAW TOOTH.

(Nb Model.)

Patented May 22, 1888.

INVENTUR 2! MW 8 am ywmassg s.

PATENT rricn.

FREDERICK W. COOK, OF SAN FRANCISCO, CALIFORNIA.

INSERTED SAW TOOTH.

SPECIFICATION forming part of Letters Patent No. 383,103, dated May 22,1888.

(No model.)

.To aZZ whom it may concern:

Be it known that I, FREDERICK XV. (Icon, of the city and county of SanFrancisco,State of California, have invented a new and Improved Means ofSecuring Inserted Teeth in the Plates of Circular Saws, of which thefollowing is a specification.

lhe invention relates more particularly to the means of fastening thecutting-bits within their holder-plates and to the means of insertingand removing the said bits; and it consists in the peculiar form of theholder-plate, as particularly described below.

In the accompanying drawings, forming a part of this specification,Figure 1 is a perspective view of a broken-off portion of a sawplatewith my improvement applied thereto. Fig. 2 is a side, and Fig. 3 anedge, view of my key used to spring open the holderplate in removing orinserting the bits.

In the drawings, Fig. 1, A is a brokenoff part of a saw-p1ate, which isprovided at regular intervals at its periphery with proper re cesses toreceive the tooth or cuttingbit holders B.

O is the cutting-bit.

b is the spring-limb of the tooth-holder.

a a are the holes, one in the saw-plate and one in between the body ofthe toothholder and the spring-limb b.

c is a slot separating the spring-limb from the body of the holder.

d is the ordinary rivet locking the holder in its recess.

eis the usual notch in which a tool is inserted when driving out theholder from its recess.

The tooth-holder has the usual Vgrooved edge fitting the A-pointe'd edgeof the recess it fits in; also,where the outer edge of the bits bearagainst the body of the holder the same V-joint will be made. (Seedotted lines.)

At the upper part of the cutting-bits there will be shoulders f f, wherethey bear against the body of the holder and the spring-limb. There maybe a shoulder at g, where the bottom of the bit bears against the bodyof the holder. Where the lowest corner, h, of the bit bears against thespringlimb, the bit must project into a recess formed on the springlimbto receive it, as at z. This prevents the bit from flying out as the sawrapidly revolves.

The dotted line on Fig. 1, drawn from the bottom of the groove 0 to thevertical edge of the holder just below the rivet d, marks the jointbetween the springlimb and the holder, if the two should be madeseparate, as some might prefer, because, as the spring-limb more rapidlythins and wears away than will the body of the holder, it might bereplaced when worn, while still retaining the body of the holder. Thedisadvantage of this would be that in making the spring-limb separatethere might occur an undue strain on the saw-plate in driving home thecutting-bits-a matter entirely avoided where the spring-limb and body ofholder is of one solid piece of metal.

In Figs. 2 and 3 is shown the tool used to spread open the springlimbwhen inserting or removing the cutting-bits. This tool is 00111- posedof the lever D, having a pin for a fulcrum at D. On the extreme endthere is pivoted a link, E, which has its fulcrum-pin at E. hen thefulcrum-pins D and E are insert-ed, one in the hole a of the saw-plateand the other in the hole a between the body of the holder andspring-limb, and the lever D is forced into a position more nearly inline with the attached link, the effect will be to spread apart thespring-limb and allow the bit to be either inserted or withdrawn, as thecase may be.

I do not claim any novelty in the mere fact oflocking the cutting-bit inits bed bya spring limb, for there are quite a number of devices havingthis feature as a principle. My invention has no further scope than tobe an improvement in the manner of arranging the cutting-bit, holder,and spring-limb together, so as to be safer and generally more practicalthan other devices within my knowledge belonging to the same class.

What I claim,therefore, as my invention,and desire to secure by LettersPatent, is as follows:

The inserted sawtooth herein described, consisting, essentially, of theholder B, oblong in shape, fitted in a recess in the saw-plate and setlengthwise upon an approximately radial line, the upper halfof theforward edge of the ICO holder extending beyond the recess and havedgeof the holder along the bottom and up ing a spring, b,t0 hold thecutting-bit in place, the forward edge to the root of the spring I), all10 adapted to spring forward unobstructed by the combined as and for thepurpose described. saw-plate, a cutting-bit, O, inserted in the upperforward corner of the holder in a recess out I FREDERICK 0001bdiagonally therein, and a saw-plate with re Witnesses: cesses to receivethe bit-holders, the edges of GEORGE PARDY,

which extend the entire length of the back WATT L. BROWN.

